Question

what two numbers multiply to negative 18 and add to negative 3

Answer 1

-3 and 6

-3 x 6 = -18
-3 + (6) = 3

x2 + 3x - 18 = 0


(X - 3 ) (X + 6)

To summarize, since -3 and 6 multiply to -18 and add up 3, you know that the following is true:

x2 + 3x - 18 = (X - 3 ) (X + 6)